Hi Matthew, I learnt a lot from your video. The issue I face with the similar circuit is that when I measure the voltage over the second resistance (the one that is connected to the ground), the wave form is triangle shape and is not in the square form (incoming signal). Do you have any thoughts about why it is happening? Thank you!
Well one could say you are filtering the lower sideband away with the diode turned this way, and sampling / converting the high frequens into low frequens to be heard via the speaker.
thanks for this video.i am trying to make a I-V curve tracer on a breadboard to test the characteristics of various components.i have xy on my scope.i get good voltage on channel placed across my DUT,but I am stumped on getting the current thru the device on channel 2.do you have a video on placement of scope probes on breadboard to measure current thru the DUT? thanks John
you can't twist your right hand around like that, you will probably break it. there is no way anyone can point their right thumb up and point middle finger to the right and the index finger towards you?? that's not how human fingers can move. left hand could work though: thumb up, index to the right, and middle towards you. or you could swap N and S, or reverse the current flow. then the right hand would work.
Hi Matthew, thank you for your video. I know this video is relatively old at this point, but I'm hoping you might still be willing to help answer a question or two. In the tuner, are the capacitor and inductor adjusted such that they are prepared to receive exactly one length/period of oscillating current? Almost like they have exact specifications, and if an analogy was appropriate, almost like a lock with a key, or a hole to be filled? The size of the lock or hole would be the capacitance and inductance/maximized apparent resistance. So that, in essence, the tuner is a filter, or capturer, that only snags certain periods of oscillating current from all the frequencies of oscillating current sent from the antenna. And ultimately it only snags certain oscillating currents based on how much charge can accumulate at the capacitor or inductor i.e. adjusting capacitance and inductance i.e. apparent resistance. Sorry this is kinda long, but I think I was sort of understanding it as I typed it out. Please let me know if I'm actually just blatantly wrong in my understanding. Thank you so much for the video.
Thank you so much for uploading this playlist! I have wanted to learn about radios, but most other vids on youtube were too advanced. This was an excellent introduction.
Thanks for the material, very useful. Can you please explain what medium acts as "ground" in hand held battery charged radios? Where does current caused by all these unwanted frequencies escape to?
Thanks. I watched the whole radio series and much appreciated the lessons. I’m a ham who is beginning to build my own simple circuits for fun and this was really helpful in understanding how they work. Thank you!
Absolutely fantastic series, thank you. Could you let me know what book/s you would recommend, at this level, so I could continue to learn about basic AM and FM radios. I think I have found a new hobby.
Congratulations Mr. Fairbanks: this is the best explenation about how radio and its single components work I have ever seen/listened! I am saving this playlist between my favourites so I hope to find it again in the future! Great job! 🤝🏼